Collet chuck



Nov. 16, 1948.

J. G. SCHMIDT COLLET CHUCK Filed Nov. so, 1943 3 Sheets-Sheet 2 INVENTOR. do/m 6. 60/7/72/07 4. e. SCHMIDT comm cnucx INVENTOR. I dob/7 6. Jchm/df F IE 5.

Nov. 16, 1948.

Filed Nov. 30, 1943 Patented Nov. 16, 1948 1 GQISLET CHUCK lohn G. .Schmidt, ."Detroit, .Mich., assignor to Arthur V. 'Whittington,"Dtr0it,.Mih.

Arpplication'Ncvenrber 30, 1943,rSenialNo.;l2;35.6 .:11 Claims. (ohms-5.0)

Chisinventiomrelatestoa-collet chuck.

.EIt -;is the :obiect :of the linvention 'ZbDtDIQVi-dfi? .a .simple, efiective chuck, particularly one for hdldingla piece of .work, which .can be operated simply :by throwing a.-lever.-h-andle. The amount of opening of the 'chuck -.to .-receive the work can he [easily-adjusted by a-spanner plug.

L A ifurther feature is that the 'chuck can be opened and closed while dt-ismotating.

Referring to the drawings:

.-Eig. .1 isralsideelevationof the lchuok arranged itolbelused ona lathe.

Eig. .2 is .a .front elevation of .the same.

.Fig. 3 .is acrossesection son .the line I3;3 of 152.

liigA is-a cross -section on ,the'lin'e L-T4 ofFigB.

Fig. .5 is a longitudinal .section through the chuck showing the tapered sleeve contracted by .moving the sleeve and collar to the right, as compared with the position of the parts 'in Fig. 3.

Fig. '6 is a section-on "the line't li .of Fig. .3.

"Figyfiis a-sim'ilar Vi'ewshowing the parts after the'lever'has beenthrownto lock the clutch upon 'thewvork.

- I designates the arbor 'of themachine on which is screwed 'alarge, heavy collar 2. Fastened to this "by'countersunk bolts 3isa housing ring 4 and screwed into the -en'd -of this is -a threaded plug 2?, having recesses "5 to take a spanner wrenc'h. Slidably fitted into the housing-r'ing a 'sleeve 8 having a central opening with .a ta- .pered-end '1. A spring split sleeve .18 fits into the central openingo'fthe sleeve 6 and' 'has a tapered external surface '9-'-that fits into the I conical 'opening 'in the end of -thes'leeve li. A "second-m pered external surface 4'0 r'irito the conical -open'ing in the threaded plug. Bysliding sleeve '6 back and *forth in the housing ring and over the tapered surface 9 :df-t'he slotted sleeve 8, the grip on the work is aeither released or obtained. itn the position :of the shown :in :Fig. 55 the slotted sleeve is :expanded :and :does not grip ithe work for the vreason that the :flat ilzi of roam :12 ;is bearing :against theawall ;of the annular groove 13 in the sleeve 6. This is :the position of the parts shown :in Fig. '7. When this :camsis shifted clockwise :from the 'position :shown in Fig. :6 to thatshowniin Fig. 7., .itservesato thrustrthelsplit sleeve 5 to the right in :E'ig. 5 land this aconical :surfia-ce rides :up the ponical surface :9 on the 'split sleeve 8 and .contraots Lthflt sleeve upon the Work.

*Llhere :are :three of these .ca-m-s J2, will "be iby cconsultineEig/A. .Each .1 cam isrotatahly -:supnorted in the housing :ring 4 and (is :carried 011213118 end'of-an .arcuatevarm 7L4. .Atithe lfrevor swinging .end .of this arm is re pin d5 .which rides in the annular groove in the interiorv .face {ed the z-sliding collar 1:! which .rides .back :and forth on the exterior tof -.collar 2 and housing ring 4. Ehis sliding dollar -is made up of \two sections -:that are screwed together, as shown .in the drawings. There r-is an (external .annular groove m8. In'this, groove engageapair oftrollers L9 which freely rotate lOI]. the :studs :20 rat the :end of rthe rSCLBW i211. .llihese .mollers are (carried on the ring 22.whioh1hasaat the-one side (or the :bottomzanaear cor-knuckle 52:3 which is secured =sbertweenfme knuckles 524 ibyxmeans oi .the pintledli. 'These knuckles E24 are :seeured aon tthe nbe'd'ifi :of *the machine; .for iins'tanoe, ta. lathe. .This wine can be thrown to thelright in Fig. 1 itoloclewise) serves to throw the sliding ucollar "Ii-.1 .to tithe -1"ig'ht"from the position s'hown to that Fig. 6. This throws the three arcuate arms 4 1 dlockwise (see Figs. 6 and '7) anddromthe'position shown in Fig. 6, thus biingingthe hi'g'h point f the 'cam against the-right wall o'fthegro ove lit-thereby moving the sliding sleeve 6 to the right and 'causing the conicalior-tapered surface I to slide up the tapered exterior "surface -9 of the split sleeve Bandtherebyooritrat thetsleeve upon the work and grip it. "Totreleasethe "work just the opposite throw is given to the lever arm and'the ring 22.

The amount ofopenin'g of the gripping sleeve 8 when the parts have released is determined by the adjustment of theit'hreadedplug 21. 'The further outthis plug screwed the greater the opening of the spr'iilg leeve.

.This makes-a very efiectiveeollettype of chuck which .is.simp1e in construction and number of parts and which is givena maximum .thl'OW with alminimum\movement.of the leveinarm. By .pro- .viding a plurality of scams and cam operating arms -.or ilevers distributed :at equidistant .points around the .ring the .thrust isievenly distributed rand there isino tendency of .the;.parts to cramp.

What I .claim is:

-.l. A-colletehuckhavingiinzcombination a-housting ,ring, a sleeve .s'lidable :therein, one :or .more \cams each provided withanarm and ,journalled in'the housing .ring to turn on a radial axis for causing the sleeve atoslide @therein when thercam operated, .a split spring :sleeve in relation to which the sliding sleeve moves :and which is thereby \caused to (engage the work or be released .from ithe work, an internally and annular/1y grooved tcollarton the-outside of the ,housingiior controlling the operation of the one or more cams by turning the cam arm which engages in said groove and means on the outside of the collar having a rotative relation with the collar for causing the collar to operate the cams to grip or release the work.

2. The combination claimed in claim 1 in which the means on the outside of thecollar is a lever member which is arranged in relative rotative relation with the collar by which the lever can be thrown to slide the collar to operate the cam or cams to cause sliding of the sleeve and thereby distort the split. sleeve to grip the work or the release of the split sleeve to release the work.

3. The combination claimed in claim 1 in which the collar is slidable and provided with an annular groove in its external surface and the means on the outside of the collar is a combined lever. and ring adapted to be hinged to the machine and provided with one or more rollers which engage the said sliding collar in the said annular groove.

4. The combination claimed in claim 1 and in which the sliding sleeve has a central opening with a flared conical end and in which the split sleeve fits into the opening and has a flared, thickened conical outside surface that fits into the conical internal surface of the said sliding sleeve whereby longitudinal movement of the sliding sleeve and the two engaging conical surfaces either causes contraction of the split sleeve to grip the work or allows expansion of the split spring sleeve to release the work.

5. The combination claimed in claim 1 in which the split sleeve is provided with a tapered or conical external surface directed outwardly of the end of the sleeve and in which a threaded plug is screwed into the end of the casing and is provided with a conical central opening cooperating with the last mentioned tapered or conical surface of the split sleeve to adjustably limit the outward opening of the sleeve.

6. A collet chuck having in combination a housing ring, a sleeve slidable therein, one or more cams supported in the housing for causing the sleeve to slide therein when the cam is operated, a split spring sleeve over which the sliding sleeve moves and which is thereby caused to contract upon the work or be released from the work, means on the outside of the casing for controlling the operation of the one or more cams and a second means on the outside of the first means having a rotative relation with the first means for causing the first means to operate the cams to grip or release the work, the said first mentioned means being a sliding collar-having an internal and annular groove, and said cam or cams having cylindrical members journalled in the housing ring, and each having an arcuate arm having a stud-like projection on the end engaged in the annular groove on the inside of the sliding collar.

7. A collet chuck having in combination a housing ring, a sleeve slidable therein, one or more cams supported in the housing for causing the sleeve to slide therein when the cam is operated, a split spring sleeve over which the sliding sleeve moves and which is thereby caused to contract upon the work or be released from the work, means on the outside'of the casing for controlling the operation of the one or more cams and a second means on the outside of the first means having a rotative relation with the first means for causing the first means to operate the cams to grip or release the work, the cam or cams having each a cylindrical member journalled in the said housing ring and provided with an arcua e .6V?!

5 trainer is rotating or stationary.

arm arranged to be engaged and operated by the said first mentioned means and each cam having an inwardly projecting flattened stud portion arranged to engage in an annular groove in the sliding sleeve.

8. A chuck comprising a tubular retainer adapted to be rigidly attached to a rotatable spindle, a collet mounted in said retainer, a collet actuating bushing mounted to slide axially on said collet, cams mounted to turn on radial axes in said retainer and having portions engageable with said bushing to move the same axially, a sleeve slidable axially upon said retainer, means operably connecting said sleeve to said cams to turn the same upon axial movements of said sleeve, and means for shifting said sleeve.

9. A chuck comprising a tubular retainer adapted to be rigidly attached to a rotatable spindle, a collet mounted in said retainer, 2. collet actuating bushing mounted to slide axially on said collet, cams mounted to turn on radial axes in said retainer and having portions engageable with said bushing to move the sam axially, a sleeve slidable axially upon said retainer, means operably connecting said sleeve to said cams to turn the same upon axial movements of said sleeve, said sleeve having a circumferential external groove and a lever for shifting said sleeve provided with pins projecting into said groove.

10. A chuck comprising a housing ring, adapted to be rigidly attached to a rotatable spindle, a split spring sleeve mounted on said ring and having a tapered portion, a peripherally recessed sleeve guided in said housing ring to slide axially on said split sleeve, said slidable sleeve having a tapered portion engaging the tapered portion of the split sleeve to move portions of the same radially to grip an article, a cam having a journal portion rotatably supported to turn on a radial axis in said ring and having an actuating surface located on the inside of the ring and engaged in said peripheral recess of said sleeve and adapted to move the sleeve axially when the cam is rotated, an annularly and externally grooved and internally recessed collar slidable axially upon said ring, a lever arm secured to the journal portion of said cam and located on the outside of said ring, a pin secured on the free end of the lever arm and engageable in the internal recess of said collar to swing the lever arm and cam when the collar is moved axially 0n the housing ring, and manually operable means having a projection engaging in the annular external groove of the collar to move the sleeve axially of the retainer while the re- 11. A chuck comprising a tubular retainer adapted to be rigidly attached to a rotatable spindle, a collet having portions adapted to be moved radially to grip an article and 'a tapered surface on the side of the collet radially opposite the gripping side of the collet, .a bushing provided with a circumferential groove and slidable in the retainer relative to the collet, said bushing having a tapered surface adapted to engage the tapered surface of the collet, a sleeve provided on the inside with a pin-receiving groove and slidable longitudinally of the retainer, said sleeve provided with an external annular groove, a cam rotatable on a radial axis in the retainer and having an actuating surface on the inside of the retainer adapted to contact a wall of the circumferential groove of the bushing to move the bushing longitudinally of the retainer, an arm on the outside of the tubular retainer attached to the cam to turnthe same and provided with a pin on its free end adapted to engage in the pin-receiving groove of the collar to turn the arm and the cam when the collar is moved longitudinally of the retainer, and a pivoted hand lever having a projection engaging in the outer annular groove of the collar to move the same longitudinally of the retainer when the lever is swung on its pivot.

JOHN G. SCHMIDT.

REFERENCES CITED The following references are of record in the file of this patent:

5 UNITED STATES PATENTS Number Name Date 442,230 Libby Dec. 9, 1890 1,402,720 Bartlett et a1 Jan. 3, 1922 10 2,335,721 Zagar Nov. 30, 1943 

